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Efficient Imperfect Competition with an Application to International Trade

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  • Guido Menzio

Abstract

I study the equilibrium and the welfare effects of international trade when product markets are imperfectly competitive due of search frictions—as in Burdett and Judd (1983)—rather than product differentiation—as in Dixit and Stiglitz (1977). Markups are positive, even though there are multiple firms producing identical goods. Markups depend negatively on the number of firms producing identical goods, which, in turn, determines the extent of competition in the market. Markups may be increasing, constant, decreasing or non-monotonic in firm's size, depending on the extent of competition and on the distribution of marginal costs. The entry of firms and the quantity of output produced by each firm are efficient, even though the market is imperfectly competitive. International trade increases the measure of firms in the market, intensifies competition, lowers markups, and unambiguously increases welfare. These "natural" effects of trade emerge generically in the Burdett-Judd model of imperfect competition. In the Dixit-Stiglitz model of imperfect competition, these effects are an artifact of particular specifications of preferences.

Suggested Citation

  • Guido Menzio, 2024. "Efficient Imperfect Competition with an Application to International Trade," NBER Working Papers 33253, National Bureau of Economic Research, Inc.
  • Handle: RePEc:nbr:nberwo:33253
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    More about this item

    JEL classification:

    • D43 - Microeconomics - - Market Structure, Pricing, and Design - - - Oligopoly and Other Forms of Market Imperfection
    • D83 - Microeconomics - - Information, Knowledge, and Uncertainty - - - Search; Learning; Information and Knowledge; Communication; Belief; Unawareness
    • F12 - International Economics - - Trade - - - Models of Trade with Imperfect Competition and Scale Economies; Fragmentation
    • L16 - Industrial Organization - - Market Structure, Firm Strategy, and Market Performance - - - Industrial Organization and Macroeconomics; Macroeconomic Industrial Structure

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